FROM TH2F
constant
53.72597634443457+-0.9091498679129557
chi2/ndof = 38.62986822801165
plane
-46.9017564322332+-6.59527327336687
invpt slope = 15.509324364506815+-0.6039014746986248
theta slope = 64.29304298875981+-5.909404439199514
chi2/ndof = 27.76847785934343
from tgraph2D
constant
94.70050106965343+-6.4385376686545905
chi2/ndof = 2901.8337187627976
plane
-3.6270032617627415+-38.270394484009685
invpt slope = 13.246390852254255+-2.6387638585008375
theta slope = 59.39651190689006+-32.342811562042684
chi2/ndof = 2162.5381558706663